Fixed issue 697 allowing Object.create to be called with a function....

src/v8natives.js

Index: src/v8natives.js
===================================================================
--- src/v8natives.js	(revision 4607)
+++ src/v8natives.js	(working copy)
@@ -660,7 +660,8 @@
 
 // ES5 section 15.2.3.5.
 function ObjectCreate(proto, properties) {
-  if (!IS_OBJECT(proto) && !IS_NULL(proto)) {
+  // IS_OBJECT will return true on null covering that case.
+  if (!IS_OBJECT(proto) && !IS_FUNCTION(proto)) {
     throw MakeTypeError("proto_object_or_null", [proto]);
   }
   var obj = new $Object();